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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Available-for-sale |  |
Amortized Cost | $ 679,264 | $ 584,507
Gross Unrealized Gains | 22,323 | 8,508
Gross Unrealized Losses | (234) | (611)
Fair Value | 701,353 | 592,404
Held-to-maturity |  |
Amortized Cost | 73,823 | 88,477
Gross Unrealized Gains | 4,494 | 2,276
Gross Unrealized Losses |  | (224)
Fair Value | 78,317 | 90,529
Total Amortized Cost | 753,087 | 672,984
Total Gross Unrealized Gains | 26,817 | 10,784
Total Gross Unrealized Losses | (234) | (835)
Total Fair Value | 779,670 | 682,933
U.S. government agency |  |
Available-for-sale |  |
Amortized Cost | 75,881 | 49,113
Gross Unrealized Gains | 3,061 | 529
Gross Unrealized Losses | (7) | (27)
Fair Value | 78,935 | 49,615
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 191,453 | 131,241
Gross Unrealized Gains | 6,885 | 2,503
Gross Unrealized Losses | (28) | (6)
Fair Value | 198,310 | 133,738
Held-to-maturity |  |
Amortized Cost | 28,528 | 45,239
Gross Unrealized Gains | 1,507 | 1,340
Fair Value | 30,035 | 46,579
Mortgage-backed: Agency residential |  |
Available-for-sale |  |
Amortized Cost | 211,577 | 198,184
Gross Unrealized Gains | 5,393 | 2,780
Gross Unrealized Losses | (101) | (286)
Fair Value | 216,869 | 200,678
Held-to-maturity |  |
Amortized Cost | 16,516 | 19,072
Gross Unrealized Gains | 567 | 161
Gross Unrealized Losses |  | (170)
Fair Value | 17,083 | 19,063
Mortgage-backed: Agency commercial |  |
Available-for-sale |  |
Amortized Cost | 133,149 | 133,730
Gross Unrealized Gains | 5,022 | 1,516
Gross Unrealized Losses | (22) | (292)
Fair Value | 138,149 | 134,954
Held-to-maturity |  |
Amortized Cost | 28,779 | 24,166
Gross Unrealized Gains | 2,420 | 775
Gross Unrealized Losses |  | (54)
Fair Value | 31,199 | 24,887
Corporate |  |
Available-for-sale |  |
Amortized Cost | 67,204 | 72,239
Gross Unrealized Gains | 1,962 | 1,180
Gross Unrealized Losses | (76) |
Fair Value | $ 69,090 | $ 73,419

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- Definition Amount of accumulated unrecognized gain on investment in debt security available for sale and held to maturity at amortized cost. + References No definition available. + Details
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